Emirates use 2-3-2 on their 330s yet you only hear good things about their J product. Also how many airlines in the world use 2-3-2 seating in J on their 777/747s?! Stacks. Granted, the seats are maybe an inch and a bit wider but I cannot imagine it makes that much difference, especially on sectors under 5 hours. Hell, BA use 2-4-2 in their J class on widebodies!
QF DONT make money from domestic J class. Why wouldn't they try and maximise the return on poorly performing product? They would be stupid not to!
It will be better than those covertible seats on the 737s (especially being trapped in a window seat!). The centre seat will be used LAST. ie. you have more a chance of having the seat in the middle free - more space for you.
There is some photos of the EK J class interior for the 330 on airliners.net. Have a look. It isn't all that bad.